Hydrotropism \Hy*drot"ro*pism\, n. (Bot.)
In a broader sense, any curvature or turning induced in
certain growing plant organs under the influence of moisture.
Note: When the movement is toward the moisture, as is the
case in most roots, the phenomenon is called positive
hydrotropism; when away from the moisture, as in the
case of hyphae of certain fungi, negative
hydrotropism.
Source: Webster's Revised Unabridged Dictionary (1913)
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